Fosi Audio BT20A mini amplifier (The pocket Rocket)
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- เผยแพร่เมื่อ 22 ส.ค. 2021
- Another TPA3116 amplifier 2x100W in a small compact package with a Bluetooth 5.0 built-in and line input. I was impressed with the power and bass line. On those Sony SS-H551 speakers, this thing sounds so nice. But this amp can easily feed more powerful speakers.
I like that it has the ability to adjust the treble and bass.
Fosi Audio BT20A mini amplifier link:
s.click.aliexpress.com/e/_AkVFMa
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Ok … truly speechless. Thanks for the video.
I've ordered one of these amps and it should be delivered in three days. It should do a fine job of powering my Technics speaker system for my desktop PC.
Soon after I ordered, I had a hindsight! I wish I'd bought an amp with headphone output.
Good review, thanks.
I've been using one of these for the past week or so and I'm very impressed. I worked in audio for several years, and I'd have to say the performance of these class D amps is extraordinary. I've replaced an antique Hitachi HA-3, and the difference in sound quality is significant - the Fosi is much cleaner, clearer and brighter. And as a bonus, takes virtually no space and consumes a fraction of the power my old amp did. If you don't need multiple inputs (who does, these days) stop sitting on the fence and go buy one of these.
Driving this from a Focusrite DAC, and it all sounds great - the DAC gives me a headphone output, too. I'll probably never use the Bluetooth input, but it is nice to have.
Still not got used to having Bass control on the right and Treble on the left, though. Whose idea was that?
Just got one and this thing gave my Infinity SL-20 bookshelf speakers new life and just seems like its just a resurrection. Connected to my computer via the headphone 3.5 to it using a 3.5 to RCA.
I wonder if using the DAC-Q4 would make any difference in the already nice and clear sound I am getting... Good Review. Thanks for this video.
Yes, you can use the USB output of your computer to connect to fosi audio Q4
I got this with a set of Polk es20 speakers for my garage set up and have been really enjoying them.
Hi,
I ordered the same amplifier and also ordered 2 bookshelf speakers from polk the XT15’s.
Just a question …
Do i need to buy the connectors that are plugged in to the amplifier via the speaker cable too ??
@@T0NIK69 I did but you don’t have too. The amp has a regular screw type binding post that can handle bare wire. The posts are pretty close to each other and would need to carful with the wires. I would recommend the banana plugs.
@@darthbane4980
Ok, thank you very much for that quick feedback
I will order some banana plugs on Amazon then
Thanks bro
@@T0NIK69 you’re welcome
Is there any way to connect subwoofer ? thanks for the video
Sony's G-series are great speakers with great sound quality. G55/H551 if I'm not mistaken 🤔
im planning to install mine on my datsun 510
Which is better the BT20A or the BT30D? No subwoofer and running it to 2 Klipsh outside wall mount speakers.
What speakers are you using in review?
Sony h551 speaker and sony lv909 speaker
Which one better?
For fun, I connected this small amplifier to the kef ls50, I must admit that I was amazed.
My expensive Hiend 50W amp is not that much better at all.
Kef ls50 requires an amplifier of at least 100 W, at least that's what they say, and the whole time I thought there was no point in connecting that cheap Chinese amplifier.
I don't believe in Fosi's 100w, but they obviously have the power to drive such demanding speakers.
Audiophiles would say that what I've done is crazy, but I'll have to do some side-by-side testing and see what sounds better. Also i use Topping d30 in that combo.
All the best to Fosi.
Call me weird, but I much prefer having a physical button/switch to change inputs. I want to decide what input is selected.
Me too. I'm using "Fosi Audio BT20C" having it.
@@RustamVID I just got the ayima t04. And it had the physical input switch. Still annoying that my phone connects when set to rca, it merely changes input instead of turning off the bt, but it works
this is not a real big amplifier with more inputs, there is nothing to switch, it's permanently in AUX mode and BT on, when you connect to it's bluetooth, it switches to BT mode, so when you don't need BT, just remove antenna and don't care about that
@@Pidalin Я подключал TV по AUX. Постоянно включенный bt даёт очень сильные помехи. Это очень плохо.
Review AP100H please. 2 tpa3116d2 with compact body
How to connect equalizer? You cannot get good sound quality without a filter.
Can i use it to amp my jbl 710?
I got this little amp a few days ago. I didn't expexted very much,i have to tell. But it realy suprised me(in the positive way)! The sound is realy good(atleast for my ears). Enough treble and bass, enough power, unbelievable. But it's realy a very tiny amplifier, i don't care. I was planning to buy an Argon Audio SA-1 amplifier, also very cheap in the audio world(€349,-) and very good match with the Dali's(same company, i guess), i hearded it in a hifi shop. This is also a class D amplifier and looks a lot better than the Fosi Audio.
It's connected on a Bluesound Node 2i streamer(great dac inside) and a pair of Dali Oberon 5👍 floorstanding speakers.
Before the Fosi Audio BT20 A, i used a (total restored) Sansui AU-4400 an AU-505 amplifier(both class A/B amplifiers i think). But the sound of this small amp is not realy worse ,comparing to both Sansui amps. Specialy not about the price i payed for the restored(realy well done) Sansui's comparing the price i payed for the Fosi Audio!
For the price (about €86,-), i think this amp is hardly to beat. For the AU-4400 i payed €300,- and for the AU-505 i payed €225,-, it's a lot of work, i know.
Great stuff!! So..you don't have to spend hundreds or thousands of dollars/euro's for a affortable sounding amplifier, if you are not a real audiophile. (good)Speakers and dac are important.
Sorry, my english is not the best..
It sounds really good for that price and size, definitely better than the cheapest classic amplifiers (class AB) like Madison MAD1305, that's really poor amplifier for like 125 eur in my country. My father had one and it worked correctly, it was not that bad, but noise is very strong and sound is very distorted on higher volume. I bought the same amplifier and it was bad piece, it has totaly distorted sound in mid frequencies, so I was using it only as amplifier for subwoofer where it was no problem. This little chinese magicbox on other hand works pretty well for how it's small and cheap, it's class D, so you can't expect hi-fi highend sound from that, but as I said, it sounds much better than the cheapest classic "big" amplifiers. I would say that there are 2 main disadvantages of these tiny amplifiers: first, it doesn't have headphone amplifier integrated and second: it uses switching power supply (not a real transformator) and you can hear bzzzzz sound because of that on high volume, when you connect real transformator power source, it sounds better. But joke is that transformator which can give you 12-24V and more than 100W cost more than this amplifier. 😀 For my big speakers I have Yamaha A-S501 and it's really great with great power for big speakers, but when you look on it how it's big and heavy, it's just magic that such a little chinese noname box can play too.
@@Pidalin Indead; for the price and size.
But not better than my recapped Sansui AU-317(i bought it maybe a month later than the Fossi Audio BT20A).
Do you used amplifier external o additional ?
can these power the micca rb42
How far can you walk away with your phone before it breaks up ??
I'm more curious how this might sound with a Turntable along with a Preamp?
can we connect 4 20 Watt passive speakers with this?
May i know name of the audio track?
Silly question- but, I want to use my 25 year old Infinity tower speakers to listen to my music on my iPhone. Can this Amp be wired directly to my Infinity tower speakers and stream music via Bluetooth?
2/6/2022
My Sansui SP-3000 have 80W max. Will the BT20A work with my speakers?
yes, but it's weird to feed such nice old speakers from this toy amplifier
Available India?
Are those regular rca connections you plugged in the back of the box for speaker output?
No, those two RCA are line input.. the bigger 4 ones are for speakers..
Please riview fosi hd-a1
How much price of this amplifier?
How much
Does anyone know if I can power this with a 12v car battery? Or maybe a 20v dewalt battery? Or a milwaukee battery?
Just buy a voltage regulator with socket
Hi! Do you think there will be any difference if I plug in 19v power supply instead of 24v?
Yes
Might cause distortion at max volume, or if you are using a 90w 19v laptop charger wich i assume you are, you are gonna hit well, only 90w, or 45w per channel
But otherwise you're good, nothing else, it'll probably work fine, just less loud. Did you alread do it, did it work fine?
@@davpro1792 hey, sorry for the late reply. I ended up getting this amp with 24v power brick:) Thank you for the info!
Hi ,
I’ve just ordered this amplifier this afternoon.
Could you tell me how does the blue tooth work without Bluetooth switch ?
I don’t find any switch of it.
It seems there isn’t any Japanese instructions of this amplifier.
Looking into these wish it had a remote for volume
huh ? isnt the phone the remote ?
@@sdqsdq6274 what if you want to play sound through the TV. Don't want TV speakers working at same time
@@drew6090 there another model with remote i think
Whats stops your neighbor trolling you with bluetooth?
Nothing. That's why I'm trying to return mine back to the Fosi audio store, stupid deisgn.
why is it called power amp? does it need a pre-amp?
The device providing the music has the pre amp
@@spacepodi Ah Ok. An integrated amp has both pre and power, and the pre-amp part is only applicable for the phono (turntable) input?
I have 4 speakers. How do I wire them up to this?
it has only outlets for 2 speakers
Only if it lasted, they only last for about a year.
A real 100 watts would blow out those speakers
this device would be lava if 2x100 watts are in that case without cooling or airflow
@@Zr1_R Nope, it can really have 2x100W. There is more types of amplifiers, find amplifier class and what does it mean. Classic hifi amplifier is 100% analog (class A or AB) which should have sound with lower distortion, but it's very innefective, you need big power supply and it consumes much more electricity than you really use for making sound, it has like 50-60% efficiency. These little amplifiers are class D which works completely different, it's partly digital with no oldschool linear transistors, it's operated by chip or processor and it has like 90% efficiency, so it can be much smaller and you can use switching power supply (you don't need real transformator) which is mostly not inside of these little amplifiers but external, so it can be this small and have that power, but it's not a hi-fi thing.
BTW integrated amplifiers in active speakers work on same principle.
@@Pidalin could not have said it better cheers.
красавчики, гоняю с 25АС-416
The are many reviews of these tiny "pocket rockets" claiming high power output of 100 to 600 watts. Wonder why no one has actually measured the real output
Just a heads up. If you're going to buy this, DON'T buy it from the Fosi Audio store. I'm trying to return mine (unopened unused) and they keep stringing me along and don't want to refund me. Their warranty service is probably just as bad.
☆☆☆☆☆☆☆
if only it has aptx bt
There are other amps that have it, just double the price.
@@centauri8820 i already bought one and received it , yet to test since i dont have power adaptor , what confusing it state 2 x 100w , when i ask fosi audio, that dude says it cant power 2 x 100 watt speaker , wtf
those speakers are starving for more power.
with this power supply, 24 V / 4.5 A power supply., you cannot get 100w per speaker. do the math
The math you get 108 watts total
so 54 watts per channel
That would be correct if your amp had 0% losses. In reality all amps have losses
I'm not into electronics but I kind of figure the same thing.. I was looking at the power supply and that's what made me think of. It was powerful enough
That's actually good thing, amplifier himself has reserve, but it's cutted by power suply so you don't push that amplifier to extreme. And BTW, even 2x40-50W is enough for such speakers, it probably doesn't have more than 2x50W RMS. If you want to push it more, power supply with like 150+W and 24V will cost the same as this amplifier, so it doesn't makre really sense. Also it's better to use real transformator insead of switching power supply, there will be less bzzzzz sound on high volume. If someone would like to use more powerfull power supply, I recommend solder better connector to that, pushing like 10A thru these power connectors could be too much.
@@martingo2680 Few years ago, I had soundbar with subwoofer which had 200W written on box, guess what was inside? Few 5W speakers, 20W subwoofer and it was everything powered by 45W power supply. 🙂
Plz give it to me...
Small but terible